package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import jakarta.annotation.Resource;
import jakarta.servlet.http.HttpSession;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;


import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.如果不符合，返回错误信息
        return Result.fail("手机号格式错误");
        }
        //3.符合就生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4.保存验证码到redis,必须设置有效期
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY +phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5.发送验证码
        log.debug("发送验证码成功，验证码：{}",code);
        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(loginForm.getPhone())){
            return Result.fail("手机格式错误！");
        }
        //2.校验验证码,从redis中获取
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + loginForm.getPhone());
        String code = loginForm.getCode();
        if(cacheCode == null || !cacheCode.equals(code)){
            //3.不一致，报错
            return Result.fail("验证码错误");
        }
        //4.一致，根据手机号查询用户 select * from tb_user where phone = ?
        User user = query().eq("phone",loginForm.getPhone()).one();
        //5.判断用户是否存在
        if(user == null){
            //6.不存在，创建新用户，保存到数据库中
            user = createUserWithPhone(loginForm.getPhone());
        }
        //7.保存用户信息到redis中
        //7.1生成token作为登录令牌
        String token = UUID.randomUUID().toString();
        //7.2将user对象转换为hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        //Long类型的不能转成string类型
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true).setFieldValueEditor((fieldNmae,fieldValue)->fieldValue.toString()));
        //7.3存储
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY + token,userMap);
        //7.4 设置有效期,超过30不登录才清除
        stringRedisTemplate.expire(LOGIN_USER_KEY + token,LOGIN_USER_TTL,TimeUnit.MINUTES);


        //8.返回token
        return Result.ok(token);
    }
    private User createUserWithPhone(String phone){
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX +RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }
}
